1//===- SimplifyLibCalls.h - Library call simplifier -------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file exposes an interface to build some C language libcalls for 11// optimization passes that need to call the various functions. 12// 13//===----------------------------------------------------------------------===// 14 15#ifndef LLVM_TRANSFORMS_UTILS_SIMPLIFYLIBCALLS_H 16#define LLVM_TRANSFORMS_UTILS_SIMPLIFYLIBCALLS_H 17 18namespace llvm { 19 class Value; 20 class CallInst; 21 class DataLayout; 22 class Instruction; 23 class TargetLibraryInfo; 24 class LibCallSimplifierImpl; 25 26 /// LibCallSimplifier - This class implements a collection of optimizations 27 /// that replace well formed calls to library functions with a more optimal 28 /// form. For example, replacing 'printf("Hello!")' with 'puts("Hello!")'. 29 class LibCallSimplifier { 30 /// Impl - A pointer to the actual implementation of the library call 31 /// simplifier. 32 LibCallSimplifierImpl *Impl; 33 34 public: 35 LibCallSimplifier(const DataLayout *TD, const TargetLibraryInfo *TLI, 36 bool UnsafeFPShrink); 37 virtual ~LibCallSimplifier(); 38 39 /// optimizeCall - Take the given call instruction and return a more 40 /// optimal value to replace the instruction with or 0 if a more 41 /// optimal form can't be found. Note that the returned value may 42 /// be equal to the instruction being optimized. In this case all 43 /// other instructions that use the given instruction were modified 44 /// and the given instruction is dead. 45 Value *optimizeCall(CallInst *CI); 46 47 /// replaceAllUsesWith - This method is used when the library call 48 /// simplifier needs to replace instructions other than the library 49 /// call being modified. 50 virtual void replaceAllUsesWith(Instruction *I, Value *With) const; 51 }; 52} // End llvm namespace 53 54#endif 55